TM 1-1520-265-23
Change 3 2-11
Figure 2-6. M ain Rotor Hub
2.6.3.7 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
2.6.4
Backup Method. Fluorescent Penetrant, refer to paragraph 1.4.7.
2.6.5
System Securing. The main rotor hub, if removed, requires installation in accordance with
the applicable technical manuals listed in Table 1-1.
2.7 SPINDLE (ET).
2.7.1
Description (Figure 2-7, Index No. 7). The spindle couples the blade to the main rotor head.
The main rotor head contains four spindle assemblies.
2.7.2
Defects. The inspection is used to verify crack indications found visually on the spindle. No
cracks are allowed.
2.7.3
Primary Method. Eddy Current.
2.7.3.1 NDI Equipment and Materials. (Refer to Appendix B.)
a. Eddy Current Inspection Unit
b. Probe, straight, shielded surface, 2 MHz
c. Probe, right angle, shielded surface, 2 MHz, 90_ 1/2 inch drop,
